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Quill stem classic single-piece type Threadless stem shown with cable hole. The stem is the component on a bicycle that connects the handlebars to the steerer tube of the bicycle fork. Sometimes called a goose neck, [1] a stem's design belongs to either a quill or threadless system, and each system is compatible with respective headset and fork ...
In the days of quill stems, a road stem was clearly identifiable from its "7" shape, but nowadays it can be hard to tell the difference between a "road" (26.0 mm [1 + 1 ⁄ 32 in]) and "MTB" (25.4 mm [1 in]) stem. Manufacturers frequently omit the clamp size from advertising or packaging.
EN 1078, entitled Helmets for pedal cyclists and for users of skateboards and roller skates, is a European standard published in 1997. It is the basis of the identical British Standard BS EN 1078:1997. [1]
Cycle helmet wearing rates in the Netherlands and Denmark are very low. [77] [93] [94] An Australian journalist writes: "Rarities in Amsterdam seem to be stretch-fabric-clad cyclists and fat cyclists. Helmets are non-existent, and when people asked me where I was from, they would grimace and mutter: "Ah, yes, helmet laws."
The star nut may be replaced by a self expanding wedge in some designs. The bolt compresses the stem down onto spacers, usually aluminum, which in turn compress the headset bearing cups. The preload bolt does not hold the fork onto the bike; after the preload is set, the stem bolts must be tightened to secure the fork in place.
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Bell moved to Long Beach, California in 1968. The first Bell helmet with full-face protection was developed at this location. [7] In 1980, the company merged with football helmet maker Riddell to form "Bell-Riddell". The Bell-Riddell motorcycle division was sold in 1991, becoming "Bell Helmets". The remaining company was renamed "Bell Sports".
Mountain biking (abbr. MTB) is a sport of riding bicycles off-road, often over rough terrain, usually using specially designed mountain bikes.Mountain bikes share similarities with other bikes but incorporate features designed to enhance durability and performance in rough terrain, such as air or coil-sprung shocks used as suspension, larger and wider wheels and tires, stronger frame materials ...